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Stella [2.4K]
3 years ago
15

2. Which of the following is the term used to describe a body's resistance to a change in motion? A. Inertia B. Acceleration C.

Mass D. Gravity
Chemistry
1 answer:
Vanyuwa [196]3 years ago
4 0
Helpppo meeee pleasee
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If the half-life of hydrogen-3 is 11.8 years, after two half-lives the radioactivity of a sample will be reduced to one-half of
maw [93]

Answer:

False

Explanation:

Half life is the time period at which the concentration of the radioactive substance in decay reduced to half.

<u>Thus, if the hydrogen-3 has gone 2 half lives, it means that it has first reduced to its half and then again the half of what it was, i.e. 1/4</u>

Thus, after two successive half-lives, the concentration must be 1/4 of the initial concentration and hence, the statement is false.

4 0
3 years ago
Students in a chemistry class are drawing molecular models based on molecular formulas they are given by the teacher.
Karo-lina-s [1.5K]
Sorry I need this marks
5 0
3 years ago
2. When paleontologists study fossils, which is true of the fossil record that they find?
juin [17]

Answer:

Explanation:

d

7 0
3 years ago
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Find the no. of atoms present in 40g of nitrogen gas at STP?
nika2105 [10]

Answer:

8.60 * 10^{23} atoms N2

Explanation:

We want to convert grams to moles and then moles to atoms.

First, we convert grams of nitrogen gas (which is N2) to moles. To do so, we need the molar mass of N2, which is just 14.01 * 2 = 28.02 g.

40 g N2 * \frac{1 mol N2}{28.02 g N2} = 1.43 mol N2

Now, we need to convert moles to atoms by using Avogadro's number, which is 6.022*10^{23}:

1.43 mol N2 * \frac{6.022*10^{23} atoms N2 }{1 mol N2} = 8.60 * 10^{23} atoms N2

Thus, the answer is 8.60 * 10^{23} atoms N2.

6 0
3 years ago
Due Tuesday 09-07-2021 Please help immediately!! I have 10 missing assignments from being absent
jeka57 [31]

Answer:

Go to

On the left, click Missing.

(Optional) To review more details, click an item. View details.

Explanation:

7 0
2 years ago
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